/*M///////////////////////////////////////////////////////////////////////////////////////
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//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install,
//  copy or use the software.
//
//
//                        Intel License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2000, Intel Corporation, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
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//   * Redistribution's in binary form must reproduce the above copyright notice,
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//   * The name of Intel Corporation may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
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// This software is provided by the copyright holders and contributors "as is" and
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//M*/

#ifndef _GRFMT_PxM_H_
#define _GRFMT_PxM_H_

#include "grfmt_base.h"
#include "bitstrm.h"


class GrFmtPxMReader : public GrFmtReader
{
public:
    
    GrFmtPxMReader( const char* filename );
    ~GrFmtPxMReader();
    
    bool  CheckFormat( const char* signature );
    bool  ReadData( uchar* data, int step, int color );
    bool  ReadHeader();
    void  Close();

protected:
    
    RLByteStream    m_strm;
    PaletteEntry    m_palette[256];
    int             m_bpp;
    int             m_offset;
    bool            m_binary;
    int             m_maxval;
};


class GrFmtPxMWriter : public GrFmtWriter
{
public:
    
    GrFmtPxMWriter( const char* filename );
    ~GrFmtPxMWriter();

    bool  WriteImage( const uchar* data, int step,
                      int width, int height, bool isColor );
protected:

    WLByteStream  m_strm;
};


// PxM filter factory
class GrFmtPxM : public GrFmtFilterFactory
{
public:
    
    GrFmtPxM();
    ~GrFmtPxM();

    GrFmtReader* NewReader( const char* filename );
    GrFmtWriter* NewWriter( const char* filename );
    bool CheckSignature( const char* signature );
};


#endif/*_GRFMT_PxM_H_*/